Axial quasinormal modes of neutron stars in a one-parameter DHOST gravity family deviate from general relativity and obey a Regge-Wheeler-like equation in an effective conformal metric.
In the following, we explain how the matter action at quadratic order is computed
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Neutron stars in degenerate higher-order scalar-tensor theories: Axial perturbations
Axial quasinormal modes of neutron stars in a one-parameter DHOST gravity family deviate from general relativity and obey a Regge-Wheeler-like equation in an effective conformal metric.